408 D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
PROTECTION FLEXLOGIC CHAPTER 7: PROTECTION
Dropout Delay
Range: 0 to 3600000000 ms in steps of 1
Default: 0
This setting specifies the time delay to dropout. If a dropout delay is not required, set this
value to “0.”
Non-volatile latches
The non-volatile latches provide a permanent logical flag that is stored safely and does not
reset upon reboot after the relay is powered down. Typical applications include sustaining
operator commands or permanently blocking relay functions, such as autoreclose, until a
deliberate interface action resets the latch. There are 16 non-volatile latches available for
use in protection schemes.
Select the Settings > Protection > Protection FlexLogic > Non-Volatile Latches menu to
open the non-volatile latches configuration window.
Figure 351: Non-volatile latches configuration settings
The following settings are available for each latch.
Function
Range: Enabled, Disabled
Default: Disabled
This setting enables and disables the corresponding protection non-volatile latch.
Type
Range: Reset Dominant, Set Dominant
Default: Reset Dominant
This setting selects the non-volatile latch as set-dominant or reset-dominant.
Set
Range: any FlexLogic operand or shared operand
Default: OFF
If the operand assigned to this setting is asserted, the non-volatile latch is set.
Reset
Range: any FlexLogic operand or shared operand
Default: OFF
If the operand assigned to this setting is asserted, the non-volatile latch is reset.
Events
Range: Enabled, Disabled
Default: Disabled
This setting enables and disables the logging of non-volatile latch events in the
sequence of events recorder.
The following table summarizes the operation of non-volatile latches.
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